Water dripping from vent pipe

I recently removed my laundry pump in my basement. At the time, I did not have a proper cap to cap the vent pipe, so I temporarily covered it with a clear plastic bag until I could get a proper cap.

When I went to install the proper cap, I noticed that water had accumulated in the plastic bag. Is this rain/snow water that is making its way down through the vent pipe on the roof, or is it just condensation from some air getting up into the pipe? I would hate to cap it just to have it fill up with water.

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Water dripping from vent pipe

Sorry, maybe I wasn't clear when I described it. The bag is actually inside the house in the basement covering the vent where it went into the old laundry pump. The vent on the roof is free to breath as it should be.

I know I need to cap the vent in the basement (not really into the methane gas in the house idea), but I'm not sure if I can just cap it where it went into the old laundry pump, or if I need to re-route the vent pipe somewhere else.

Water dripping from vent pipe

Guessing that the water is condensation. The air in the house is warm and is meeting colder air from outside (coming into the pipe) and causing it. Your cap should be fine. The vent is also a part of the main drain and the water should leave the house the same as all other drains.

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